"In 2½ years the price of a Bitcoin has increased from $25 to $975," says Wien. "The supply of bitcoins is fixed at 21 million with 11.5 million in circulation. Bitcoins lack gold’s position as a store of value over time. During the year Bitcoin’s acceptance collapses as investors realize that it cannot be used as collateral in financial transactions and its principal utility is for illegal business dealings where anonymity is important."